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    • 28. 发明授权
    • Distortion compensation circuit
    • 失真补偿电路
    • US06385436B1
    • 2002-05-07
    • US09429081
    • 1999-10-29
    • Kenichi HoriguchiMasatoshi NakayamaYukio Ikeda
    • Kenichi HoriguchiMasatoshi NakayamaYukio Ikeda
    • H04Q720
    • H03F1/3229H03F1/3223H03F3/24H04B2001/0441
    • Conventional distortion compensation circuits have addressed the problem that their distortion compensation amount is greatly reduced at levels other than the designed power level. The present invention provides a distortion compensation circuit that comprises: a vector adjuster; a linearizer; a linear signal extraction path for extracting part of an input signal from the input side of the vector adjuster; a nonlinear signal extraction path for extracting part of an output signal from the output side of the amplifier; a level detector for detecting a combined power level of the signals from the linear signal extraction path and the nonlinear signal extraction path; and a control circuit for adjusting a bias of the linearizer in accordance with the detected combined power level, electrically adjusting the linearizer so that the power detected by the level detector is minimized, and adjusting the vector adjuster so that the power detected by the level detector is minimized every time the linearizer is adjusted. As a result, the distortion compensation circuit of the present invention can optimize distortion compensation at all times independently of the average power changes of the input signal, the secular changes of the amplifier and the state changes of the amplifier caused by temperature changes.
    • 传统的失真补偿电路已经解决了它们的失真补偿量在设计功率水平以外的水平大大降低的问题。 本发明提供了一种失真补偿电路,包括:矢量调节器; 线性化器 线性信号提取路径,用于从矢量调节器的输入侧提取输入信号的一部分; 非线性信号提取路径,用于从放大器的输出侧提取输出信号的一部分; 电平检测器,用于检测来自线性信号提取路径和非线性信号提取路径的信号的组合功率电平; 以及控制电路,用于根据检测到的组合功率电平来调整线性化器的偏置,电调节线性化器,使得由电平检测器检测到的功率最小化,并且调整矢量调节器使得由电平检测器检测到的功率 每次线性化调节器被最小化。 结果,本发明的失真补偿电路可以随时独立于输入信号的平均功率变化,放大器的长期变化和由温度变化引起的放大器的状态变化而随时优化失真补偿。